Orthogonal time frequency space precoding of control channel and shared channel communications

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may precode a physical sidelink control channel (PSCCH) communication using a first delay-Doppler precoder. The UE may precode a physical sidelink shared channel (PSSCH) communication using one or more second delay-Doppler precoders. The UE may transmit the PSCCH communication and the PSSCH communication in a slot after precoding the PSCCH communication and the PSSCH communication. Numerous other aspects are described.

What is claimed is: 
     
       1. A user equipment (UE) for wireless communication, comprising:
 a memory; and 
 one or more processors, coupled to the memory, configured to:
 precode a physical sidelink control channel (PSCCH) communication using a first delay-Doppler precoder; 
 precode a physical sidelink shared channel (PSSCH) communication using one or more second delay-Doppler precoders; and 
 transmit the PSCCH communication and the PSSCH communication in a slot after precoding the PSCCH communication and the PSSCH communication. 
 
 
     
     
       2. The UE of  claim 1 , wherein the first delay-Doppler precoder comprises a first inverse symplectic finite Fourier transform (ISFFT);
 wherein the one or more second delay-Doppler precoders comprise one or more second ISFFTs; 
 wherein the one or more processors, to precode the PSCCH communication, are configured to convert a plurality of delay-Doppler symbols of the PSCCH communication to a first plurality of time-frequency domain symbols using the first ISFFT; and 
 wherein the one or more processors, to precode the PSSCH communication, are configured to convert a plurality of delay-Doppler symbols of the PSSCH communication to a second plurality of time-frequency domain symbols using the one or more second ISFFTs. 
 
     
     
       3. The UE of  claim 2 , wherein the one or more processors are further configured to:
 modulate the first plurality of time-frequency domain symbols and the second plurality of time-frequency domain symbols to generate a time domain signal for the PSCCH communication and the PSSCH communication; and 
 wherein the one or more processors, to transmit the PSCCH communication and the PSSCH communication, are configured to transmit the time domain signal. 
 
     
     
       4. The UE of  claim 1 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is less than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to precode the PSSCH communication using the one or more second delay-Doppler precoders, are configured to:
 precode the SCI-2 and a first data portion of the PSSCH communication using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precode a second data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       5. The UE of  claim 1 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to precode the PSSCH communication using the one or more second delay-Doppler precoders, are configured to:
 precode a first data portion of the PSSCH communication using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; 
 precode the SCI-2 and a second data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precode a third data portion of the PSSCH communication using a fifth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       6. The UE of  claim 1 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to precode the PSSCH communication using the one or more second delay-Doppler precoders, are configured to:
 precode a first portion of the SCI-2 using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; 
 precode a second portion of the SCI-2 and a first data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precode a second data portion of the PSSCH communication using a fifth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       7. The UE of  claim 1 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is equal to a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to precode the PSSCH communication using the one or more second delay-Doppler precoders, are configured to:
 precode the SCI-2 using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precode a data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       8. The UE of  claim 1 , wherein the one or more processors, to transmit the PSCCH communication and the PSSCH communication, are configured to transmit the PSCCH communication and the PSSCH communication with one or more guard subcarriers between frequency resources of the PSCCH communication and frequency resources of the PSSCH communication;
 wherein the one or more guard subcarriers comprise at least one of:
 zero-value symbols, or 
 one or more cyclic prefixes of symbols in which the PSCCH communication and the PSSCH communication are transmitted. 
 
 
     
     
       9. The UE of  claim 1 , wherein the one or more processors, to precode the PSCCH communication using the first delay-Doppler precoder, are configured to precode a plurality of delay-Doppler symbols of the PSCCH communication and a plurality of delay-Doppler symbols of a first demodulation reference signal (DMRS) to a first plurality of time-frequency domain symbols using the first delay-Doppler precoder; and
 wherein the one or more processors, to precode the PSSCH communication using the one or more second delay-Doppler precoders, are configured to precode a plurality of delay-Doppler symbols of the PSSCH communication and a plurality of delay-Doppler symbols of a second DMRS to a second plurality of time-frequency domain symbols using the one or more second delay-Doppler precoders. 
 
     
     
       10. A UE for wireless communication, comprising:
 a memory; and 
 one or more processors, coupled to the memory, configured to:
 receive a physical sidelink control channel (PSCCH) communication and a physical sidelink shared channel (PSSCH) communication in a slot; 
 decode the PSCCH communication using a first delay-Doppler decoder; and 
 decode the PSSCH communication using one or more second delay-Doppler decoders. 
 
 
     
     
       11. The UE of  claim 10 , wherein the first delay-Doppler decoder comprises a first symplectic finite Fourier transform (SFFT);
 wherein the one or more second delay-Doppler decoders comprise one or more second SFFTs; 
 wherein the one or more processors, to decode the PSCCH communication, are configured to convert a plurality of time-frequency domain symbols of the PSCCH communication to a first plurality of delay-Doppler symbols using the first SFFT; and 
 wherein the one or more processors, to decode the PSSCH communication, are configured to convert a plurality of time-frequency domain symbols of the PSSCH communication to a second plurality of delay-Doppler symbols using the one or more second SFFTs. 
 
     
     
       12. The UE of  claim 10 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is less than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to:
 decode the SCI-2 and a first data portion of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decode a second data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       13. The UE of  claim 10 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to:
 decode a first data portion of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; 
 decode the SCI-2 and a second data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decode a third data portion of the PSSCH communication using a fifth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       14. The UE of  claim 10 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to:
 decode a first portion of the SCI-2 using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; 
 decode a second portion of the SCI-2 and a first data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decode a second data portion of the PSSCH communication using a fifth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       15. The UE of  claim 10 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is equal to a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to:
 decode the SCI-2 using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decode a data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       16. The UE of  claim 10 , wherein the one or more processors, to decode the PSCCH communication using the first delay-Doppler decoder, are configured to decode a plurality of delay-Doppler symbols of the PSSCH communication and a plurality of delay-Doppler symbols of a first demodulation reference signal (DMRS) to a first plurality of time-frequency domain symbols using the first delay-Doppler decoder; and
 wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to decode a plurality of delay-Doppler symbols of the PSSCH communication and a plurality of delay-Doppler symbols of a second DMRS to a second plurality of time-frequency domain symbols using the one or more second delay-Doppler decoders. 
 
     
     
       17. The UE of  claim 10 , wherein the one or more processors are further configured to:
 identify a location, in the slot, of second stage sidelink control information (SCI-2) of the PSSCH communication based at least in part on at least one of:
 an explicit indication, included in the PSCCH communication, of the location of the SCI-2, or 
 a quantity of frequency resources, in the slot, for the SCI-2 and a quantity of frequency resources multiplexed with the PSSCH communication in the slot. 
 
 
     
     
       18. The UE of  claim 10 , wherein the one or more processors, to decode the PSSCH communication using the one or more second delay-Doppler decoders, are configured to decode second stage sidelink control information (SCI-2) of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and
 wherein the one or more processors are further configured to:
 determine, based at least in part on the SCI-2, that a data portion of the PSSCH communication is not associated with the UE; and 
 refrain from decoding the data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders based at least in part on determining that the data portion of the PSSCH communication is not intended for the UE. 
 
 
     
     
       19. A method of wireless communication performed by a user equipment (UE), comprising:
 precoding a physical sidelink control channel (PSCCH) communication using a first delay-Doppler precoder; 
 precoding a physical sidelink shared channel (PSSCH) communication using one or more second delay-Doppler precoders; and 
 transmitting the PSCCH communication and the PSSCH communication in a slot after precoding the PSCCH communication and the PSSCH communication. 
 
     
     
       20. The method of  claim 19 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is less than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein precoding the PSSCH communication using the one or more second delay-Doppler precoders comprises:
 precoding the SCI-2 and a first data portion of the PSSCH communication using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precoding a second data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       21. The method of  claim 19 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein precoding the PSSCH communication using the one or more second delay-Doppler precoders comprises:
 precoding a first data portion of the PSSCH communication using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; 
 precoding the SCI-2 and a second data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precoding a third data portion of the PSSCH communication using a fifth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       22. The method of  claim 19 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein precoding the PSSCH communication using the one or more second delay-Doppler precoders comprises:
 precoding a first portion of the SCI-2 using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; 
 precoding a second portion of the SCI-2 and a first data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precoding a second data portion of the PSSCH communication using a fifth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       23. The method of  claim 19 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is equal to a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein precoding the PSSCH communication using the one or more second delay-Doppler precoders comprises:
 precoding the SCI-2 using a third delay-Doppler precoder of the one or more second delay-Doppler precoders; and 
 precoding a data portion of the PSSCH communication using a fourth delay-Doppler precoder of the one or more second delay-Doppler precoders. 
 
 
     
     
       24. A method of wireless communication performed by a user equipment (UE), comprising:
 receiving a physical sidelink control channel (PSCCH) communication and a physical sidelink shared channel (PSSCH) communication in a slot; 
 decoding the PSCCH communication using a first delay-Doppler decoder; and 
 decoding the PSSCH communication using one or more second delay-Doppler decoders. 
 
     
     
       25. The method of  claim 24 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is less than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein decoding the PSSCH communication using the one or more second delay-Doppler decoders comprises:
 decoding the SCI-2 and a first data portion of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decoding a second data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       26. The method of  claim 24 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein decoding the PSSCH communication using the one or more second delay-Doppler decoders comprises:
 decoding a first data portion of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; 
 decoding the SCI-2 and a second data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decoding a third data portion of the PSSCH communication using a fifth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       27. The method of  claim 24 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is greater than a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein decoding the PSSCH communication using the one or more second delay-Doppler decoders comprises:
 decoding a first portion of the SCI-2 using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; 
 decoding a second portion of the SCI-2 and a first data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decoding a second data portion of the PSSCH communication using a fifth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       28. The method of  claim 24 , wherein a quantity of total resources, in the slot, for second stage sidelink control information (SCI-2) of the PSSCH communication is equal to a quantity of total resources that are frequency multiplexed with the PSCCH communication in the slot; and
 wherein decoding the PSSCH communication using the one or more second delay-Doppler decoders comprises:
 decoding the SCI-2 using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and 
 decoding a data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders. 
 
 
     
     
       29. The method of  claim 24 , further comprising:
 identifying a location, in the slot, of second stage sidelink control information (SCI-2) of the PSSCH communication based at least in part on at least one of:
 an explicit indication, included in the PSCCH communication, of the location of the SCI-2, or 
 a quantity of frequency resources, in the slot, for the SCI-2 and a quantity of frequency resources multiplexed with the PSSCH communication in the slot. 
 
 
     
     
       30. The method of  claim 24 , wherein decoding the PSSCH communication using the one or more second delay-Doppler decoders comprises decoding second stage sidelink control information (SCI-2) of the PSSCH communication using a third delay-Doppler decoder of the one or more second delay-Doppler decoders; and
 wherein the method further comprises:
 determining, based at least in part on the SCI-2, that a data portion of the PSSCH communication is not associated with the UE; and 
 refraining from decoding the data portion of the PSSCH communication using a fourth delay-Doppler decoder of the one or more second delay-Doppler decoders based at least in part on determining that the data portion of the PSSCH communication is not intended for the UE.